Apart from that, Client, Server, ConnectSecure, and MFT Events do not really use TLS at all.

OpenSSL is used only to implement FIPS encryption mode and Tectia uses only cryptographic operations from this library (those are listed in documentation). Therefore, Tectia Client/Server/ConnectSecure/Events could not be affected by this vulnerability at all. Furthermore, it will not be affected by any future vulnerability in implementation of TLS in OpenSSL.